<template>
  <!-- 底部 -->
  <div class="my-footer">
    <!-- 全选 -->
    <div class="custom-control custom-checkbox">
      <input type="checkbox" v-model="isAll" class="custom-control-input" id="footerCheck">
      <label class="custom-control-label" for="footerCheck">全选</label>
    </div>
    <!-- 合计 -->
    <div>
      <span>合计:</span>
      <span class="price">¥ {{ allPrice }} </span>
    </div>
    <!-- 按钮 -->
    <button type="button" class="footer-btn btn btn-primary">结算 ( {{ allCount }} )</button>
  </div>
</template>

<script>
export default {
    props: {
        list: {
            type: Array,
            required: true
        }
    },
    computed: {
        isAll: {
            set(val) {
                this.$emit('changeAll', val)
            },
            get() {
                return this.list.every(item => item.goods_state)
            }
        },
        allPrice() {
            return this.list.reduce((sum, item) => {
                if(item.goods_state) {
                    return sum += item.goods_price * item.goods_count
                }
                return sum
            },0)
        },
        allCount() {
            return this.list.reduce((sum, item) => {
                if(item.goods_state) {
                    return sum +=  item.goods_count
                }
                return sum
            },0)
        }
    }   

}
</script>

<style lang="less" scoped>
.my-footer {
  position: fixed;
  z-index: 2;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 10px;
  background: #fff;

  .price {
    color: red;
    font-weight: bold;
    font-size: 15px;
  }
  .footer-btn {
    min-width: 80px;
    height: 30px;
    line-height: 30px;
    border-radius: 25px;
    padding: 0;
  }
}
</style>